试题:
求未知数:
x.
2
3
x-1=0.9×
2
3
1
9
2
3
=8:x.

答案:

我来补答
(1)
2
3
x-1=0.9×
2
3

      
2
3
x-1+1=0.6+1,
          
2
3
x=1.6,
        
2
3
÷
2
3
=1.6÷
2
3

             x=2.4;

(2)
1
9
2
3
=8:x,
       
1
9
x=
2
3
×
8,
   
1
9
x÷
1
9
=
16
3
÷
1
9

          x=48.
 
 
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